(PU)Kusatopa, Kutentha Kwambiri, Elastomer Yodzichiritsa Yopangidwa ndi Polyurethane: Yopangidwa ndi Dynamic Covalent Adaptive Network Based on Ascorbic Acid

Ofufuza apanga buku la polyurethane elastomer yotengera ascorbic acid-derived dynamic covalent adaptive network (A-CCANs). Pogwiritsa ntchito mphamvu ya synergistic ya keto-enol tautomerism ndi ma dynamic carbamate bonds, zinthuzo zimapindula kwambiri: kutentha kwa kutentha kwa 345 ° C, kupsinjika kwa 0.88 GPa, mphamvu yopondereza ya 268.3 MPa (mayamwidwe amphamvu a 68.93 M³), ndi astural 68. 0.02 pambuyo pa mizungu 20,000. Imawonetsanso kudzichiritsa pawokha pamasekondi pang'ono ndikubwezeretsanso mpaka 90%, ndikupereka yankho lopambana lakugwiritsa ntchito zida zanzeru ndi zida zamapangidwe.

Kafukufuku wodabwitsawu adapanga ma dynamic covalent adaptive network (A-CCANs) pogwiritsa ntchito ascorbic acid ngati chomangira choyambira. Kupyolera mu keto-enol tautomerism yopangidwa bwino komanso ma bond amphamvu a carbamate, polyurethane elastomer yodabwitsa idapangidwa. Nkhaniyi imasonyeza kuti polytetrafluoroethylene (PTFE) -monga kutentha kwa kutentha-ndi kutentha kwa kutentha kwapakati kufika 345 ° C-posonyeza kusasunthika kokhazikika komanso kusinthasintha: kupsinjika kwenikweni kwa fracture ya 0.88 GPa, ndi kukwanitsa kukhalabe ndi nkhawa ya 268.3 MPa pansi pa 99.9% kutsekemera kwa 689%. MJ·m⁻³ wa mphamvu. Chochititsa chidwi kwambiri, nkhaniyi ikuwonetsa zovuta zotsalira zosakwana 0.02% pambuyo pa 20,000 makina ozungulira, amadzichiritsa mkati mwa sekondi imodzi, ndikukwaniritsa kukonzanso kwa 90%. Kamangidwe kameneka, kamene kamakwaniritsa mwambi wakuti “kukhala ndi nsomba ndi chimbalangondo cha chimbalangondo,” kumapereka njira yosinthira pakugwiritsa ntchito zinthu monga zovala zanzeru komanso zomangira zakuthambo, pomwe mphamvu zamakina komanso kukhazikika kwa chilengedwe ndizofunikira kwambiri.